Also means
to flank, to be on the side of
Usage Note
Flanquer has a colloquial sense of throwing or delivering something forcefully: flanquer une gifle ('to give a slap'), flanquer quelqu'un à la porte ('to throw someone out'). In more formal/architectural contexts it means to flank a building. The two registers are clearly distinct.
Examples
"Il lui a flanqué une gifle."
Natural Translation
He slapped him.
Literal Translation
He threw him a slap.

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